Ukuthuthukiswa kanye nokusetshenziswa kwei-polycarboxylic superplasticizerkuyashesha uma kuqhathaniswa. Ikakhulukazi kumaphrojekthi amakhulu nabalulekile afana nokongiwa kwamanzi, amandla kagesi, ubunjiniyela bamanzi, ubunjiniyela basolwandle, namabhuloho, i-polycarboxylate superplastisizer isetshenziswa kabanzi.
Ngemuva kokuthi usimende uxutshwe namanzi, i-cement slurry yenza isakhiwo se-flocculation ngenxa yamandla adonsela phansi ezinhlayiya ze-samente, ukuze i-10% kuya ku-30% yamanzi okuxuba ihlanganiswe ezinhlayiyeni ze-cement futhi ayikwazi ukubamba iqhaza ekugelezeni kwamahhala kanye nokugcoba, ngaleyo ndlela kuthinte i-Flowability yokuxuba ukhonkolo. Lapho i-supreplasticizer ingeziwe, ama-athomu e-ejenti yokunciphisa amanzi angakhangiswa ngendlela eqondile ebusweni bezinhlayiya zikasimende, ukuze izindawo zezinhlayiya zikasimende zibe necala elifanayo (ngokuvamile elibi), okwenza ukuxoshwa kwe-electrostatic, okukhuthaza ukuhlakazeka okuhlangene kwezinhlayiya zikasimende nokubhujiswa kwesakhiwo se-floc. , ukukhulula ingxenye yamanzi asongwe ukuze abambe iqhaza ekugelezeni, ngaleyo ndlela akhulise ngokuphumelelayo uketshezi lwengxube yekhonkrithi.
Iqembu le-hydrophilic ku-i-ejenti yokunciphisa amanzii-polar kakhulu, ngakho-ke ifilimu ye-adsorption ye-ejenti yokunciphisa amanzi ebusweni bezinhlayiya zikasimende ingenza ifilimu lamanzi elizinzile elinama-molecule amanzi. Le filimu yamanzi inomphumela omuhle wokugcoba futhi inganciphisa ngempumelelo ukumelana nokuslayida phakathi kwezinhlayiya zikasimende, ngaleyo ndlela ithuthukise uketshezi lodaka nokhonkolo.
Iketanga legatsha le-hydrophilic ku-superplasticizerisakhiwo sinwebeka esixazululweni esinamanzi, ngaleyo ndlela sakhe isendlalelo se-hydrophilic se-adsorption enezinhlangothi ezintathu ezinogqinsi oluthile ebusweni bezinhlayiya zikasimende ezikhangisiwe. Lapho izinhlayiya ze-samente ziseduze komunye nomunye, izingqimba ze-adsorption ziqala ukudlulana, okungukuthi, ukuvinjelwa kwe-steric kwenzeka phakathi kwezinhlayiya ze-cement. Uma kunqwabelana kakhulu, kukhulu ukunyanyeka kwe-steric, futhi kukhulu ukuvinjelwa kokuhlangana phakathi kwezinhlayiya zikasimende, okwenza udaka nokhonkolo I-Slump ihlale iyinhle.
Ngesikhathi kulungiselelwa inqubo yei-ejenti yokunciphisa amanzi ye-polycarboxylate, amanye amaketanga anamagatsha axhunyelelwa kuma-molecule e-ejenti yokunciphisa amanzi. Lolu chungechunge lwamagatsha aluhlinzeki nje kuphela umphumela wokuvimbela i-steric, kodwa futhi, endaweni ephakeme ye-alkalinity ye-samente hydration, Iketanga legatsha lingaphinde linqunywe kancane, ngaleyo ndlela likhulule i-polycarboxylic acid ngomphumela wokuhlakazeka, ongathuthukisa umphumela wokuhlakazeka kwezinhlayiya zikasimende nokulawula ukulahlekelwa ukuwohloka.
Isikhathi sokuthumela: Mar-29-2024